摘要
对南海东北部海区 (12～ 2 2°N、116～ 12 2°E) 15 5个表层样品进行了超微化石分析。结果显示 ,各站位样品超微化石总丰度相差悬殊 ,最多可达 1198枚 ,最少则样品中未发现超微化石。在总共 15 5个样品中 ,总丰度大于30 0枚的为 49个 ,占 31.6 % ,30 0～ 1枚之间的为 5 9个 ,占 38.1% ,未发现超微化石的样品有 47个 ,占 30 .3%。同时 ,超微化石在平面分布上可分成 7个区。超微化石组合主要由 15属 2 2种组成 ,在大多数样品中都是以Florisphaera profunda占绝对优势 ,这与南海其它地区超微化石组合面貌有明显差别。还讨论了影响超微化石分布的可能因素 ,包括水深、陆源物质稀释、碳酸盐溶解作用、海水透明度及营养跃层深度等等 ,并据超微化石的分布推测研究区北部碳酸盐补偿深度在 34 0 0 m左右 ,而南部可能在 35 0 0 m以上 ,同时推测该区海水营养跃层可能普遍偏深。
Calcareous nannoplankton analysis has been carried out for 155 surface sediment samples taken from the northeastern parts of the South China Sea(12～22°N,116～122°E).The results show that the total abundance of calcareous nannofossils is different among the samples.The highest abundance of nannofossils is 1 198,but nannofossils are absent in some samples.49 samples,each of which has a total abundance of more than 300,59 samples with total abundance between 300 and 1,and 47 samples without nannofossils have been found.The nannofossil assemblages are composed of 15 genera and 22 species,and Florisphaera profunda is the most dominant species in most of the samples.These assemblages are different from those in the other parts of the South China Sea.The factors controlling the distribution of nannofossils are also discussed in the paper,which include the depth of surface sediments,the dilution of terrigenous materials,deep sea carbonate dissolution,the depth of nutricline and the sea water turbidity.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2001年第3期23-28,共6页
Marine Geology & Quaternary Geology
基金
国家重点基础研究专项经费资助项目(G19990 43 4 0 9)
国家自然科学基金资助项目 (499995 60 )
